Yes, you are Misha)
There are ceveral kinds of one name in Russia, e.g.
Anna-Anya-AnyUta-An'ka
MarIya-MAsha-MAshen'ka-MAshka
Tat'yAna-TAnya-TanyUsha-TanyUha-TAn'ka
SergEi-Ser'yOja-SEryi...
So, MihaIl-MIsha-MIshka...